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-   -   Mini Split AC Hook Up (http://www.diychatroom.com/f18/mini-split-ac-hook-up-197772/)

skymaga 03-14-2014 08:32 AM

Mini Split AC Hook Up
 
I have a few questions about hooking up a mini split AC unit (condensor sits outside and evaporator hangs on living room wall). Here are the spec for it:

12,000 BTU w/ Heat Pump
Power Supply: 115V/60Hz
Rated Current - Cooling - 13 amps
Rated Current - Heating - 14.5 amps
Cooling Capacity - 12,000 BTU
Heating Capacity - 11,700 BTU
MCA (Amps) 12.2
MCOP (Amps) 25

Wire Size / # Wires AWG16/4
(I believe this refers to connecting the Condensor that is outside to the Evaporator that is inside)

I hooked up the evaporater via 14-4 AWG 600-volt mini split cable ( specifically made for this application).

I ran a 14 guage from fuse box to a 30amp fusable disconnect, and 14 guage from disconnect to condesnor.

Fuse box at main panel has a 15amps (AC motor specific delay) fuse (there is nothing else hooked up to it besides this mini split)

30amp 120/240V AC Disconnect, I only hooked up the hot wire using one side of the disconnect, used a 15amp fuse there, and connected the neutral together via a cap/electrical tape.

All electrical wiring is in conduit. 20 feet from panel box to AC disconnect, 20 feet from condensor to evaporator.

Any thoughts? Thanks in advance.

skymaga 03-14-2014 08:35 AM

Min Ampacity
 
Also on the condensor outside, it says that minimum ampacity is 15amps, max breaker size is 25amps.

It has been running for about a week now with heat pump on without any noticable issues. Had amperage tested on cool mode, it was drawing around 5.5-6amps on high speed (condensor and evaporator combined), lowest cooling setting.

brric 03-14-2014 08:40 AM

Sounds ok, you could go up to as high as 25 amps on the breaker.

skymaga 03-14-2014 08:45 AM

Quote:

Originally Posted by brric (Post 1321839)
Sounds ok, you could go up to as high as 25 amps on the breaker.

So if 15amp fuse is too low and it gets burned out, can I use a 25amp fuse and stay on the 14 guauge between main panel and condensor?

jbfan 03-14-2014 09:23 AM

Quote:

Originally Posted by skymaga (Post 1321841)
So if 15amp fuse is too low and it gets burned out, can I use a 25amp fuse and stay on the 14 guauge between main panel and condensor?

Yes. You can go as high as 25 amps.

TarheelTerp 03-14-2014 09:36 AM

Quote:

Originally Posted by skymaga (Post 1321841)
So if 15amp fuse is too low and it gets burned out, can I use a 25amp fuse and stay on the 14 gauge between main panel and condensor?

still won't hurt a bit to use a heavier wire and often will help
to use #12 (vs 14) or to use #10 (vs 12)

skymaga 03-14-2014 09:51 AM

Quote:

Originally Posted by TarheelTerp (Post 1321862)
still won't hurt a bit to use a heavier wire and often will help
to use #12 (vs 14) or to use #10 (vs 12)


At this point, since I already ran the wire, and it's working fine with the 15amp fuse, would you re-wire to 12 guage? What are the benefits?

The wire is on the fuses, one in the disconnect, and another one at the main fuse box.

jbfan 03-14-2014 10:17 AM

Quote:

Originally Posted by skymaga (Post 1321869)
At this point, since I already ran the wire, and it's working fine with the 15amp fuse, would you re-wire to 12 guage? What are the benefits?

The wire is on the fuses, one in the disconnect, and another one at the main fuse box.

No need to change the wire.
#14 is fine with this install.

skymaga 03-14-2014 12:13 PM

As far as the 30amp 120/220V AC Disconnect, it has two Line In and two Load In plus two screws for grounding, currently I'm only using one side of it, with running the Hot wire into Line In and running hot wire from LOAD IN to the condenser. I have the white neutral capped together and taped. I have a 15amp fuse on the pull out.

Is this the correct way to do it?

Can I put another 15amp fuse on the other side and run the white neutral threw LINE IN / LOAD IN? I would prefer for it to be screwed into place instead of being capped/taped.

rjniles 03-14-2014 12:23 PM

There is no reason to use a fused disconnect in this application. Using a 15 amp inthe disconnect defeats the purpose of using a 25 amp breaker/fuse in tbe panel.

skymaga 03-14-2014 12:29 PM

I'm currently using a 15amp at fuse box and 15amp at disconnect. If the fuse on disconnect keeps popping or at fuse box keeps popping, then I will upgrade to a 20amp on both fuse box and disconnect. Right now it's fine on 15amps. I already had a fused disconnect so I used it instead of buying a new one that's not fuseable.

Any thoughts on hookup up the neutral at the disconnect?

jbfan 03-14-2014 12:44 PM

Quote:

Originally Posted by skymaga (Post 1321936)
I'm currently using a 15amp at fuse box and 15amp at disconnect. If the fuse on disconnect keeps popping or at fuse box keeps popping, then I will upgrade to a 20amp on both fuse box and disconnect. Right now it's fine on 15amps. I already had a fused disconnect so I used it instead of buying a new one that's not fuseable.

Any thoughts on hookup up the neutral at the disconnect?

Do not connect the neutral to the disconnect.

skymaga 03-14-2014 01:05 PM

Quote:

Originally Posted by jbfan (Post 1321943)
Do not connect the neutral to the disconnect.

sounds good, I'll leave the hot black wire in the disconnect and neutral going directly from fuse box to condenser.

thanks for everyone's input.

stickboy1375 03-14-2014 05:36 PM

Just to be a pain in the ass in this thread, if you used a cable between the outdoor unit and the indoor unit, that is a code violation, most of these split units come from other countries, you need to use a chapter 3 wiring method in the US.

I see this all the time, I just purchase 14-3 UF for these installs, and throw the cable away.

skymaga 03-14-2014 05:45 PM

Quote:

Originally Posted by stickboy1375 (Post 1322059)
Just to be a pain in the ass in this thread, if you used a cable between the outdoor unit and the indoor unit, that is a code violation, most of these split units come from other countries, you need to use a chapter 3 wiring method in the US.

I see this all the time, I just purchase 14-3 UF for these installs, and throw the cable away.



I'm not familiar with what chapter 3 method is. Can you elaborate? I used a the cable described above, came together with a 25ft lineset, sold seperately by home depot from the unit.


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